Trial reportInternational journal of environmental research and public health2020
Effects of the Use of Air Purifier on Indoor Environment and Respiratory System among Healthy Adults.
Trial report in International journal of environmental research and public health, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
7 citing papers in PubMed, 43 citations in OpenAlex.
- Trial
- Health Benefits of Air Purification: A Systematic Review.Environment & health (Washington, D.C.) · 2026Review
- Air Pollution and Endurance Exercise: A Systematic Review of the Potential Effects on Cardiopulmonary Health.Life (Basel, Switzerland) · 2025Review
- Epidemiological studies on the health impact of air pollution in Japan: their contribution to the improvement of ambient air quality.Environmental health and preventive medicine · 2025Review
- Indoor Air Purification and Residents' Self-Rated Health: Evidence from the China Health and Nutrition Survey.International journal of environmental research and public health · 2022Article
- Controlled human exposure to diesel exhaust: results illuminate health effects of traffic-related air pollution and inform future directions.Particle and fibre toxicology · 2022Review
- Indoor air quality improvement in COVID-19 pandemic: Review.Sustainable cities and society · 2021Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Air purifiers have become popular among ordinary families. However, it remains controversial whether indoor air purification improves the respiratory health of healthy adults. A randomized crossover intervention study was conducted with 32 healthy individuals. The subjects were categorized into two groups. One group continuously used true air purifiers, and the other followed with sham air purifiers for 4 weeks. Following this first intervention, all the subjects underwent a 4-week washout period and continued with the second 4-week intervention with the alternate air purifiers. We collected fine particulate matter (PM) ≤ 2.5 µm in aerodynamic diameter (PM2.5), coarse particulate matter between 2.5 and 10 µm in aerodynamic diameter (PM10-2.5) and ozone (O
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.